int EEPROM problems

[Jerry R]

Wow, this seems basic, but I can't see what's wrong.

I can't seem to write to internal EEPROM in my target 16F874A using the attached code segment. I've successfuly written to internal EEPROM using similar code in past projects. Here's the code:

//Store readibg just made into ext EEPROM=======================================

Store_Reading()
{
Int_EE_Adr =20;
Int_EE_Data =33;
write_eeprom (Int_EE_Adr , Int_EE_Data);
Delay_ms(100);
Int_EE_Data = 0;
Int_EE_Data = read_eeprom (Int_EE_Adr);
Delay_ms(100);
}

Both variables in the above code are defined globally as:

unsigned char Int_EE_Adr,Int_EE_Data; //address and data

The subroutine is called from the Main as:
Main()
(
while (1) //Loop forever
{
Store_Reading();
}
}

Wasted a couple of days on troubleshooting this. ANy help is appreciated!

[PCM programmer]

Try the test program shown in this post:
http://www.ccsinfo.com/forum/viewtopic.php?t=17590&start=1

If you've been testing internal eeprom in a loop for two days, and if
at some point you didn't have the 100 ms delays, you may have burned
up your internal eeprom (at least at certain addresses). There have
been threads on this. Here is one of them:
http://www.ccsinfo.com/forum/viewtopic.php?t=26937&highlight=eeprom+burned